Could be a vacuum leak only under a load. Idle may not have enough airflow to open the "gap", but under throttle, there may be enough suction to pull air through the gap.
I had this type of leak on my spiral flex intake hose on my supercharged engine. It was leaking though the spiral under the clamp and exhibited similar lean under load condition. Could see dust tracks inside the tube that followed the spiral. KEN On Wed, Oct 29, 2008 at 9:33 AM, Chuck Wills <[EMAIL PROTECTED]> wrote: > no codes in the ECU. > ummm... I didn't check the tps voltage - i'll try that today. > thanks! > -Chuck > > Ray Ayala wrote: > > Have you checked the ECU codes and the TPS voltage (as a function of > throttle position) ? > > ----- Original Message ----- > From: Chuck Wills > To: Miatapower > Sent: Wednesday, October 29, 2008 5:26 AM > Subject: drivability problem revisited > Hey guys, > I had posted a few months ago about a serious drivability problem with a > buddies 94. > Formerly supercharged - now back to n/a with stock ECU. > > It goes very lean at any throttle setting above cruise. It's not quite lean > enough to misfire, but it's off the scale on his NB O2 gauge. It goes lean > in any gear, at virtually any RPM above 2000 or so - as soon as you give it > any throttle to accelerate. > > I've done everything I can to diagnose it, and I'm coming up empty. > > verified fuel pressure - 35 idle and 45 WOT. > Swapped ECU > swapped fuel pump (verified pressure on both pumps) > swapped O2 sensor > swapped MAF > allegedly swapped injectors (I didn't do it) > > It idles well, and doesn't appear to have a vacuum leak. We also tried > driving it with unplugged TPS and/or unplugged O2, and the behavior didn't > change at all. > > Does anyone have any other ideas? bad wiring harness? bad alignment > between mercury and venus? > We're really scratching our heads on this one, because the car really isn't > very drivable. > > -Chuck > > ________________________________ > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > > _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
